I too find the proposition of using the BP Gas bottles to be attractive but am also concerned about availability in the UK.
One largish caravan dealer this week in Oxfordshire although listed as a stockist, told me that Calor under the 'terms of their contract' had forced them, the dealer, not to make the BP light cyliners available; 'although we can get them, but no guarantees'. He did make the point which I thought was interesting to say the least, in that with BP being a global company and certainly in the UK running a number of petrol stations, he could not understand why did BP not make their petrol stations outlets expanding the availability with seemingly little effort or outlay.
If some are running as a franchised station, surely BP could use it as a 'loss leader'in the short term and make it financially attractive to such petrol stations to act as agents, just to improve its availability all round.
Does seem to be some lack of real effort on the part of BP or Truma to make this product more widely available.
I would also have thought that sites operated by the Caravan Club could and should have been approached as agents. I hope there is not a hidden agenda of maintaining a monopoly of a product being operated and the BP system will just 'disappear' through lack of users brought about by a rival company's actions!